What is the cause when i feel week (as i imagine a diabetic would feel) and break out in a sweat?

Hypoglycemia: Just as with a diabetic on medication, weakness, sweating, shaking, anxiety, can be related to low blood sugar. But other sources are possible. Get testing with your physician to find the source.

Any number of things: You need to see a provider and give a full history. Keep a diary of when this happens and what you have eaten throughout the day.